Computer Networks/Troubleshooting/Tools/Netstat/All

Netstat is a command-line tool that displays network statistics on a variety of operating systems. This activity will show you how to use the netstat command to display all active connections (TCP and UDP)

Preparation

To prepare for this activity:

1. Start your operating system.
2. Log in if necessary.

Activity 1 - Display All Active Connections

To display all active connections:

1. Open a command prompt.
2. Type netstat -a.
3. Press Enter.
4. Observe active TCP and UDP connections and listening ports, the local address and port number, the remote name or address and port number if a connection is established, and the connection status.

Activity 2 - Display All Active Connections by Number

To display all active connections by number (IP address) instead of by host name:

1. Type netstat -a -n.
2. Press Enter.
3. Observe active TCP and UDP connections and listening ports, the local address and port number, the remote name or address and port number if a connection is established, and the connection status.
4. Close the command prompt to complete this activity.

Readings

• Wikipedia: netstat

References

• Microsoft TechNet: Netstat